5 UCY - PHY - 94 / 15 Masses and decay constants of the B - system in Lattice QCD 1
نویسنده
چکیده
Heavy-light bound states are studied in Lattice QCD with emphasis on parameters of the B-system relevant to experiment. Results are obtained on lattices with lattice spacings from about 0.15 fm to 0.06 fm corresponding to = 5:74; 6:0 and 6.26, and covering sizes from about 0.7 fm to 2 fm. From our results at the innnite quark mass limit and from propagating heavy quarks with mass of about 1-2.5 GeV we extrapolate to the b-quark mass to obtain the decay constant of the B-meson as well as the mass of b in the continuum. The necessary extrapolations introduce rather large errors and lead to the value f B = 180(50) MeV. We compare with the results from other lattice groups as well as with predictions coming from sum rules. The phenomenological consequences of this value of f B , together with new experimental constraints, are brieey discussed.
منابع مشابه
Decay Constants of B and D Mesons from Non-perturbatively Improved Lattice QCD
The decay constants of B and D mesons are computed in quenched lattice QCD at two different values of the coupling. The action and operators are O(a) improved with non-perturbative coefficients where available. The results are fB = 218 +5 −5 + 5 −41 MeV, fD = 220 +3 −3 + 2 −24 MeV, fBs = 242 +4 −4 +13 −48 MeV, fDs = 241 +2 −2 + 7 −30 MeV. Systematic errors are discussed in detail. Results for v...
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